/Engine/Source/Runtime/Engine/Classes/Components/InstancedStaticMeshComponent.h
Attempt to duplicate the given static mesh instances, retrieving the IDs of any new instances.
True if any instances were duplicated, false otherwise.
virtual bool DuplicateSMInstances ( [TArrayView](API\Runtime\Core\Containers\TArrayView)< const [FSMInstanceId](API\Runtime\Engine\Elements\SMInstance\FSMInstanceId) > InstanceIds, [TArray](API\Runtime\Core\Containers\TArray)< [FSMInstanceId](API\Runtime\Engine\Elements\SMInstance\FSMInstanceId) > & OutNewInstanceIds )